The South D-wall had to be completed in 2 phases using only diamond wire cutting techniques.
The initial phase involved pre-cutting the 1.20m wide D-wall into sections varying in weight from 1.80t to 8.50t.
The second phase involved the removal of 268 l/m of cut D-wall sections and a reinforced concrete guide wall up to 1.50m thick.
Total approximate weight of concrete removed was 1650t cut into 370 sections requiring 70 lorry movements. 1480 resin anchors were installed and 100% tested to lift out the concrete sections.